Aerial eliminator



Aug l5., 1933 F. L. soBoclNsKl 1,922,335

AERIAL ELIMINATOR Filed Aug. 7, 1931 QI. NN f5 Q, Hl.. Q' Q' Patented Aug'. 15, 193s "AERIAL ELIMINATOR VIielix L. Sobccinsfki, Buffalo, N. Y., ,assigner of 1 oneehalf to Frank Wojtowicz, Buffalo, N. Y.

Application August 7, 1931. Serial No. 555,724 2 claims. `(o1. 17e- 2.5)

This invention relates to wirelessA telegraphy` or wireless telephony, and more particularly to radio wave receivers commonly known `as anten na eliminators. i

5 It is an object of the present invention to pro Videan electric wave receiver which replaces the usualaerial or antenna, and can be employed with radio receiving sets of various types.

f Another object is the provision of a wave receiver which can beY connected to an electric lighting power circuit, and which will operate efficiently. i

Afurther object ofthe invention `is the pro vision of a wave receiver which can be connected to an electric power or lighting alternate current vcircuit employed for operating alternating current radio receiving' sets. l

A still further object is to provide a simple, compact and inexpensive aerial eliminator which is designed toreduce to a minimum power line and atmospheric interference in the operation of radio receiving apparatus.

In the accompanying drawing:-

Figure 1 is a side elevation showing the invenf `tion connected to a radio receiving apparatus.

Figure 2 is a wiring diagram of a preferred embodiment of the invention. Figure 3 diagram of a modiiication.

Referring to thedrawing, the numeral indi` cates a `cabinet or casing of suitable construction within which are suitably arranged spools or coils 11, 12, each having an insulated primary winding 13` andan insulated, `secondary inductive wnding 14 thereon. In practice, the two windings f are wound in layers side by side about the core of the spools 11, l2, the ends 15, 16 o the primary windings 13 leading from the respective coils, as Vseen in Figure 2. One end 17 of each of the sec'- ondary windings leads from its respective coil 14 `10 while its oppositeend is dead, the same being in the beginning of the winding or in the first layer thereof. A `suitable, double! strand cable 16 is preferably employed for carrying the lead wires of the respective primary windings 13, the -free ends of said wires being connected to the terminals of a plug 1'9 of suitable construction which `is adapted to be electrically connected to a domestic electric light socket 20 included in an alternating current power line 21. The other ends 16 `of the primary windings 13 extend through a cable 22 and are connected to the usual Apower terminals 23, 24, respectively, of the radio receiving apparatus indicated at 25. Preferably, the secondary coils 14 contain a greater length of wire than the primary coils 13.

is wiring It will be noted that the primary coils 13` are connected in series with the power line circuit 2l, and that the power terminals of the receiving set are connected to the power circuit through the medium of these coils.

The ends 17 of the secondary windings are connected to terminal posts 26, 27 provided on the cabinet l0 and these posts are in turn connected by wires 28 and 29, respectively, with the antenna and ground posts 30 and 31 of the radio receiving set 25. Y g

In operation, the wires 16 leading from the pri-` mary windings 13 of the respective coils 11 and 12 are connected through their cable 22 to the power terminals 23, 2e of the radio receiving apparatus 25, and the wires 15 of theY primary windings `are connected,v through their cable 18 and plug 19 with the electric light socket 20 connected `with the result that the radio frequency current isinduced into `the secondary coil 14 and from thence to the set. If desired, say for receiving distant broadcasting stations, the lead wires 28 from the secondary coil terminals mayV both be connected'to the aerial post 3) of theA set and a separate ground wire connected to the ground post 3l thereof.

This improved aerial eliminator for radio receivingsets dispenses with the need for the usual in-door or out-door aerial, it is manifestly simple, compact and durable in construction, it effectually reduces toa minimum power line and atmospheric interference, thereby promoting better reception, and it is so designed that it may, if desired, be convenientlyY built into the set and form a part of the chassis thereof.

In the modification of the invention shown in Figure 3 but one coil is employed, the primary winding 32 being connected at one end by the wire 33 to the ground terminal 31 of the radio receiving set, while the other end is grounded, as indicated at 34. The secondary winding 35 is disposed in induced relation to the primary Winding 32, and is connected at one end by the wire 36 to the antenna terminal 30 of thefradio receiving set, the other end 35 being dead. This modication is preferably employed on radio receiving sets which require a source of direct current, such as a battery, for operation, and in this connection it is adapted for sets installed in automobiles. Y

I claim as my invention:

l. An aerial eliminator for electric radio receiving sets comprising, in combination with a source of electrical energy, two coils each including a primary winding connected to said source of electrical energy and with the power line of the set, and a secondary winding in inductive relation to the primary winding, the secondary winding of one coil being connected at one end to the antenna connection of the radio receiving 

